CVE-2026-76205 Overview
CVE-2026-76205 is a SQL injection vulnerability [CWE-89] in phpMyFAQ versions before 4.1.7. The flaw resides in the glossary create and update endpoints. The application truncates an escaped string before embedding it in a SQL literal, which breaks the escaping logic. Authenticated users with glossary add or edit permissions can craft a payload containing a dangling backslash to escape the closing quote and inject arbitrary SQL commands. Successful exploitation lets attackers read sensitive database contents, including credentials and stored FAQ data.
Critical Impact
Authenticated attackers with glossary permissions can inject arbitrary SQL commands and exfiltrate sensitive database contents from phpMyFAQ installations before 4.1.7.
Affected Products
- phpMyFAQ versions prior to 4.1.7
- phpMyFAQ glossary create endpoint
- phpMyFAQ glossary update endpoint
Discovery Timeline
- 2026-08-19 - CVE-2026-76205 published to NVD
- 2026-08-19 - Last updated in NVD database
Technical Details for CVE-2026-76205
Vulnerability Analysis
The vulnerability affects the glossary management endpoints in phpMyFAQ. These endpoints accept user-supplied fields intended for insertion into the underlying database. Before the field value is embedded in the SQL statement, the application applies string escaping to neutralize quote characters. The escaped string is then truncated to fit a length constraint before being interpolated into the SQL literal.
Truncation occurs after escaping, which is the root defect. If truncation cuts the escaped string at a position where a backslash was added to escape a quote, the trailing backslash remains but the escaped character it protected is removed. The resulting string ends with a dangling backslash immediately before the closing quote delimiter in the SQL statement.
When the database parses the query, the dangling backslash escapes the closing quote. The SQL literal continues past its intended boundary and consumes subsequent input as executable SQL. Attackers use the remaining query context to append UNION SELECT statements or comment out trailing SQL syntax, reading arbitrary data from any accessible table.
Root Cause
The root cause is an ordering error between escaping and truncation. Safe query construction requires that any modification to a string occurs before escaping, never after. Applying truncation to an already-escaped value produces a malformed literal that breaks SQL parsing. Parameterized queries would eliminate this class of defect entirely.
Attack Vector
Exploitation requires network access to the phpMyFAQ web interface and an authenticated account with glossary add or edit permissions. The attacker submits a glossary entry whose field length, combined with a trailing backslash, forces truncation at the escape boundary. Additional injected SQL follows the compromised quote, executing in the database context of the phpMyFAQ application user.
No verified public exploit code is available. See the GitHub Security Advisory and the VulnCheck Advisory for advisory details.
Detection Methods for CVE-2026-76205
Indicators of Compromise
- Glossary create or update requests containing overlong field values that terminate with a backslash character.
- Web server access logs showing POST requests to glossary endpoints from accounts with recently granted add or edit permissions.
- Unexpected UNION SELECT, information_schema, or SLEEP() fragments appearing in database query logs originating from the phpMyFAQ user.
- Sudden spikes in query volume or query duration against the phpMyFAQ database from the application host.
Detection Strategies
- Enable database general query logging and alert on queries containing information_schema references issued by the phpMyFAQ database user.
- Deploy a web application firewall rule that inspects glossary endpoint POST bodies for trailing backslash characters immediately before length boundaries.
- Correlate authentication logs with glossary modification events to identify low-privilege accounts performing unusual write activity.
Monitoring Recommendations
- Audit the phpMyFAQ user permission table and remove glossary add or edit rights from accounts that do not require them.
- Forward web server and database logs to a centralized analytics platform and retain them for at least 90 days to support retrospective hunting.
- Baseline normal glossary modification volume and alert on deviations that could indicate automated injection attempts.
How to Mitigate CVE-2026-76205
Immediate Actions Required
- Upgrade phpMyFAQ to version 4.1.7 or later on all instances.
- Review glossary permissions and revoke add or edit rights from non-administrative accounts until the patch is applied.
- Rotate database credentials used by phpMyFAQ if injection activity is suspected in historical logs.
- Inspect the glossary table for unauthorized modifications introduced through exploitation attempts.
Patch Information
The phpMyFAQ maintainers addressed the vulnerability in version 4.1.7. Details are published in the GitHub Security Advisory GHSA-79h3-6hxj-g98h. Administrators should apply the upstream patch rather than attempt to backport fixes to older branches.
Workarounds
- Restrict glossary add and edit permissions to a minimal set of trusted administrators until patching is complete.
- Place phpMyFAQ behind a web application firewall configured to block requests containing SQL metacharacters or trailing backslashes in glossary parameters.
- Run the phpMyFAQ database user with the minimum privileges required, denying access to unrelated tables and schemas.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
